Motor driven table saw



United States Patent 2,695,638 [1/1954 Gaskell Inventors Edward C.Warriclt Pittsburgh, Pennsylvania;

Emerson Berends, Tupelo, Mississippi 684,437

Nov. 20, 1967 Nov. 10, 1970 Rockwell Manufacturing Company Pittsburgh,Pennsylvania a corporation of Pennsylvania Appl. No. Filed PatentedAssignee MOTOR DRIVEN TABLE SAW 10 Claims, 13 Drawing Figs.

US. Cl 143/36 Int. Cl. B27b 5/24 Field of Search 143/36,

169, 132(Cur), 33 35. 36+: 83/(Inq.)

References Cited UNITED STATES PATENTS 2,945,516 7/1960 Edgemond et al.143/36 2,974,693 3/1961 Goldschmidt et al l43/36X FOREIGN PATENTS205,623 10/1923 Great Britain 143/35 Primary Examiner-Donald R. SchranAttorney--Strauch, Nolan, Neale, Nies & Kurz ABSTRACT: A tilting arbortable saw with tilt bracket and blade arbor raising and loweringcontrols, a tilt scale, and mitre gage adjustment controls and anglescale grouped and arranged for operation and viewing by an operatorstanding in operating position at the front of the saw. Table bladeopening closure plate means is provided for levelling adjustment from aabove 'the work table by the operator standing in operating position anda motor end bell provided with a radially offset blade arbor mount isdirectly joumaled in the tilt bracketfor rotational movement to effectraising and lowering adjustment of the blade through a self locking wormpinion meshing with a worm segment fixed to the motor housing carried bythe motor end bell.

Pa t nted Nov. 10,1970

Sheet mvsmons 50mm a wARn/c/r V mmsom ammo; M%%Z%w 7% ATTORNEYS namedNov. 10, 1970 3,538,964

Sheet of 4 INVENTORS EDWARD CI WARE/CK J I EMERSON BERENDS ATTORN Y5 Paten td No 10, 1970 Sheet 9....

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EDWARD C WAR/PICK INVENTORS www ww ATTORNEYS Patented Nov. 10,19703,538,964

Sheet. 4 oi 4 INVENTORS EDWARD 6f WARR/CK EMERSON HERE/V0.5

ATTORNEYS MOTOR DRIVEN TABLE SAW BACKGROUND This invention relates totilting arbor bench saws and mitre gages provided as accessory equipmenttherewith. Representative prior art directed to concentrically relatedcontrol mechanisms for such saws comprises US. Pat. Nos. 2,619,997,2,695,638 and 2,844,173 to W. L. Gaskell, 2,558,829 to F. D. Dolan,2,810,408 to W. B. Boice ct al., 2,852,047 to W. H. Odlum et al.,2,945,516 to .l. W. Edgemond, Jr. et al. and 3,01 1,529 to W. G. Copp.Representative prior art directed to adjustable table inserts compriseUS. Pat. Nos. 2,750,970 and 2,873,773 to W. L Gaskell, 2,776,682 to L.C. Mullen and 2,810,412 to G. A. Roug. Representative mitre gage priorart comprises U.S. Pat. Nos. 1,164,253 to A. G. Borntraeger, 2,356,610to H. F. Penney and 2,873,773 to W. l.. Gaskell.

SUMMARY A primary object of the present invention resides in providing atilting arbor saw with a simplified tilt bracket for directly mountingthe drive motor and arbor assembly, the tilt and arborraising andlowering controls, and tilt gage operating cam pin beneath the table, atilt gage mounted beneath the work support table in operatingjuxtaposition to the operating cam pin and a tilt gage viewing openingin the work-support table arranged to permit the operator to grasp thecontrols and view the tilt gage from a standing position in front of thetable saw while operating the controls.

A further important object of the present invention is to provide atilting arbor saw of the preceeding object with an improved mitre gagehaving an angle scale and a primary angle stop member respectivelyviewable and operable from the standing position in front of the tablesaw.

Still another object of the present invention is to provide a tiltbracket for a tilting arbor saw with a cylindrical journal opening andto incorporate the saw blade arbor in a motor end bell directly mountedin the cylindrical journal opening for angular adjustment therein toeffect raising and lowering movement of the saw blade arbor andassociated blade with respect to the work support table.

A further object of the present invention resides in directly mountingthe tilt and arborv raising and lowering controls in the form ofconcentric geared shaft means on a side face of the tilt bracket andproviding respective gear racks on the table support base and themotor'housing for operative cooperation with the respective geared shaftmeans, the gear shaft means and rack for the raising and loweringcontrol being in the form of a self-locking worm shaft pinion andcooperating rack segment.

A still further object of the present invention resides in the provisionof a mitre gage comprising a guide bar, a mitre gage body pivoted to theguide bar and including a workpiece abutment wall providing a verticallaterally directed workpiece engaging wall and an arcuate flange carriedby the abutment wall in spaced overhanging relation to the guide bar andproviding an arcuate clamping edge, upwardly facing graduated anglescale, and dependent stop lugs at the midpoint and 45 angle points ofthe scale, and a clamp block and stop assembly fixed to the guide barinoperative juxtaposition to the arcuate flange including. a stop plateselectively movable from a stop position beneath the-arcuate flangetoaninoperative position beyond the flange edge, a'clarn'p plate having anend portion I erlying the'arciiate' flange, and a clamp stud andknobassembly fixed't'o the guide bar with the stud shank passing freelyupwardl ythrough'the clamp block, stop plate, and clamp plate andthi'eadingly receiving the clamp knob for. securing thestop plate in aselected one of its-positions and clamping ,theclamp'plate against thearcuate flange to fix the mitre gage body in a selectedangular position.

" ,A. further object of the present invention resides in providing thework support table with a blade opening in laterally centered overlyingrelation to the saw blade arbor and a tilt LII gage viewingopeningforwardly in said work support table in axial centered relationto said-blade opening, pivotally mounting atilt angle indicator scale tothe base of the table saw for movement past the viewing opening inresponse to-the adspaced, inwardly extending, support ears having tappedbores therein, providing a removable-insert plate havingrablade. slottherein and securing screw openings aligned with the tapped bores of thesupport ears for closing the s'up'portt'able blade 4 opening andcompressible bushings interposed between the support ears andinsert'plate adapted, upon inserting securing screws through theplateopenings and threadingthem into the tapped bores of the support ears, topermit levelling of the table insert with the work support surface ofthe'sa'w table.

BRlEF DESCRlPTlON OFTHE DRAWINGS Otherobjects will appear from theappended claims and'following description when: read in conjunction withthe accom panying drawings wherein:

FIG. 1 is a top'plan view of a saw embodying the present in vention;

F IG. 2 isa sectional view of the saw of FIG. 1 taken substantially online 2-2of FIG. 1;

FIG. 3 is a sectional view similar to P10. 2 with the saw blade removedto better illustrate the. drive connection between the motor shaft andblade supporting arbor shaft;

FIG. 4 is a sectional view of the saw of F l6. 1 taken substantially online 4-4 of FIG. 1;

FIG. 5 is an exploded view of the motor end bell and arbor shaft supportmember and the blade arbor and arbor bearing means carried thereby;

FIG. 6 is a perspective view of tilt bracket detailing the fronttrunnionstructure thereof and the lateral through opening for journalingthe end bell of FIG. 5;

FIG. 7 is an'exploded view of the electric motor housing and" its brushassembly and the gear segment associated therewith and forming apart ofthe blade and arbor means raising. and

lowering'control means;

FIG. 8' is an enlarged fragmental sectional broken away to illustratethe mounting. of the main shaft of the tilt and blade and arbor meansraising and lowering control means and its cooperation with the gearsegment fixed to the mitre gage of the present employed to secure themotor end bell and arbor shaft support member in assembled relation inthe journal bore of the tilt bracket; and

FIG. l3is an enlarged fragmental sectional view illustrating the tiltand blade raising and lowering control shaft assembly.

DESCRIPTION OF THE PREFERRED EMBODIMENT.

With continued reference to the drawingswherein like reference numeralsare used throughout the several views of the drawings to indicate thesame parts, the tilting arbor saw 20 of the present invention isprincipally composed of a sup port base or cabinet assembly 21 having awork support table 22 bolted thereto, a tilt bracket 23 suspended fromtable 22 by from and rear trunnions 24 bolted to lands formed on thetable underside by bolts 25 (FIGS. 2 and 4) for tilt movement I viewtaken on I line 2--2 of FlGJl with a portion of the tilt support bracketaround tilt axis A (FIG. 4), a blade and arbor means 26 journalled intilt bracket 23, tilt and raising and lowering control means 27 fixed tou side wall of tilt bracket 23 through a control shaft support bracket28, u circulur saw blade 29, u pivotally mounted saw blade guardassembly 31 carried by a support bracket 32 bolted at 33 (FIG. 2) to therear end of tilt bracket 23, and a mitre gage assembly 34 (FIGS. 1, 9and As best shown in FIGS. 2, 3 and 4 support base or cabinet assembly21 is made up of a spaced pair of side plates 35 having inturned topflanges 36, inturned bottom flanges 37, inturned end flanges 38 crossconnected in opposed space relation by an angle bar 39 extending betweenthe front ends of bottom flanges 37, a strap member 41 extending betweenthe rear ends of bottom flanges 37 and a rear closure plate 42interconnected to the rear end flanges 38 through L-shaped verticallyspaced hangers 43 interfitted into vertical slots 44 formed in rear endflanges 38. Work support table 22 is bolted at the front and rear endsof top flanges 36 by bolts 45, the rear bolts only being shown inFIGS.'2, 3 and 4. As best seen in FIGS. 2,

' 3 and 4, rear closure plate 42 at its upper center is provided with anarcuate cutout portion 46 through which the blade guard support bracket32 extends.

The front end of support base or cabinet assembly 23 is spanned aboutmidway of its height by a bracket member 47 bolted at its ends tointurned front end flanges 38 and composed of a back wall 48 formed atits center portion to provide an arcuate downwardly facing rack gearsegment 49 (FIGS. 2 and 3) having axis A as its center and along itsupper edge with a forwardly directed cross flange 51 carrying adependent wull section 56 arcuately slotted at 57 opposite and belowgear segment 49 using axis A as a center for a purpose to be presentlypointed out. Dependent wall section 56 and back wall 48 at a pointlaterally centered with respect to their ends to lie in the verticalplane containing axis A and above slot 57 are provided with alignedpassages to freely pass a cap screw 58 the inner shank end of whichpivotally mounts a segment plate 59 (FIG. 11) having a journal bore 60through a sleeve bushing 61 and a retainer assembly including anabutment washer 62 and a nut 63. Segment plate 59, as will appear fromFIG. 11, is of generally triangular configuration in plan, has anarcuate edge 64 opposite journal bore 60 and is provided at its othertwo corners with arcuately shaped screw slots 65 adapted to receivemounting screws 65a for securing a generally arcuate tilt or bevel scaleplaten 66 in abutting relation to edge 64 through securing cars 67struck out of platen 66. The upper face of platen 66 has a bevel scaleplate 71 secured thereto and segment plate 59 is provided with a camslot 70 for a purpose to be hereinafter pointed out.

Work support table 22, as best seen in FIG. 1, is provided with thecustomary through blade opening 72, a respective mitre gage groove 73 ateach side of blade opening 72 extending parallel to the long axis ofblade opening 72 from the front edge to the rear edge of the table, anda through stepped circular sight opening 74 forwardly of blade opening72 to be over tilt scale 70 in laterally centered relation on the tiltaxis of the saw hereinafter described. The front and rear edges of thework support table are suitably drilled and tapped in customary mannerto mount front and rear guide rails 75 and 76 for mounting a rip fence(not shown). Rail 75, as seen in FIG. 1, is conventionally graduated toprovide a scale for accurately setting the rip fence in well knownmanner. Blade opening 72 is provided along its side edges near thebottom table face with inwardly directed, tapped ears 77 for supportinga blade opening closure insert plate 78 of conventional construction. Toassure proper levelling of insert plate 78 with the adjacently relatedtable surface, the present invention employs compressible rubberbushings 79 interposed between cars 77 and the underside of insert plate78 in surrounding relation to counter sunk securing screws 81 entereddownwardly through screw openings provided in insert plate 78 intotapped cars 77. As a consequence of this use of simple, inexpensiverubber bushings and downwardly directed screws 81, insert plate 78 canbe fully and accurately assembled from the top of work support table 22merely by entering screws 81 through the respective plate screwopenings, the respective rubber bushings and threading them into cars 77to compress the bushings until the upper plate surface is drawn downinto the blade opening until flush with the work table surface asdetermined by the eye, the touch, or sliding a test block back and forthacross insert plate 78. If insert plate 78 is found to be too high ortoo low at any point, a simple tightening or loosening of the adjacentlyrelated screw or screws 81 can be effected to adjust its level as may benecessary. Stepped sight opening 74 is fitted with a transparent lensplate 82 having an index mark 83 extending diametrically thereof tocooperate with the tilt or bevel scale 71 in reading the tilt angle ofthe saw blade as will be more fully hereinafter explained. Since it isnot necessary to remove lens plate 82 to adjust the tilt scale, it ispreferably factory fitted to assure its being level with the worksupport surface of table 22 and permanently fixed in sight opening 74 bysuitably cementing or other means.

As best seen in FIGS. 2 and 4 trunnions 24, comprise one piece stampingsproviding a planar wall 86 arcuately slotted at 87 and a continuous edgeflange right angularly related to wall 86 composed of a planar mountingflange portion 88 apertured to receive bolts 25 to secure the trunnionsto table 22 and a depending arcuate flange portion 89. Areuate slots 87are respectively dimensioned in a radial direction to provide radiallyspaced elongated arcuate wall portions 91 and 92 formed as a part of acircle having us a radius the distance between the tilt axis "A" (FIG.4) which comprises the line of intersection between the plane of thework support surface of table 22 and the median plane of saw blade 93.The respective lower wall portions 92 of trunnions 24 form tracks orrails for slidably suspending tilt bracket 23 from the underside oftable 22 through arcuate trunnion protrusions 94 provided on therespective end walls of tilt bracket 23 and of complemental arcuateconfiguration to but of shorter length than slots 87 to assure thatrelative vertical movement between trunnions 24 and tilt bracket 23 isprevented (See FIG. 6). To prevent relative axial movement between tiltbracket 23 and trunnions 24, the bases of protrusions 94 areperipherally enlarged to form abutment lands 95 which slidably bear uponthe slot defining portions of the opposing faces of the respectivetrunnion walls 86. As a consequence, tilt bracket 23 is positivelyconstrained to bodily shifting movement around tilt axis A" to therebyvary the included angle between work support table 22 and all portionsof tilt bracket 23 and any structure carried thereby.

As best shown in FIGS. 3, 6 and 8, tilt bracket 23 comprises a one piececasting comprising a cylindrical housing portion 97 having a steppedjournal bore 98 therethrough forming at one end of bore 98 an inwardlydirected annular abutment flange 99 (FIGS. 4 and 6) which constitutes ineffect an extension of outwardly converging planar wall 101 extendingaway from one side of bore 98 and carrying right angularly related,upper and lower flanges 102 (FIGS. 6 and 8) and terminating in a rightangularly related end wall 103 (FIG. 3) and extending away from theother side of housing 97 and carrying a short right angularly relatedupper flange 104 and a depending end wall 105 terminating slightly belowthe tapped car 106.

Suitable reinforcing webs 107 connect wall 101 and the trunnion bearingend walls 103 and 105 of tilt bracket 23 to reinforce the wall portionswhich extend beyond wall 101.

Tilt bracket 23 adjacent the lower right-hand quadrant of bore 98 asviewed in FIGS. 2, 3 and 6 and at the face of housing 97 opposite wall101 is provided with an integrally formed, outwardly directed,rearwardly flanged, mounting pad 108 having three tapped corner bores109 reinforced along its back wall by an integral web 111. Throughtapped bores 112 are formed in car 106 and housing 97 at 120 intervalsaround bore 98 for a purpose which will now be described in detail.

Referring to FIGS. 4,5 and 7, electric motor 113 includes a separatelymounted motor end bell and arbor shaft support member 114 (FIG. 5)having a cylindrical rim 115 dimensioned to provide a joumalled fit inbore 98 of housing 97, five inwardly directed spokes 116 and a journalboss 117 equian- 'guflarly spaced around the inside of rim 115 andterminating radially inwardly thereof in an annular ring formation 118,and a hub portion 119 carried by angularly spaced spider arms 121centered with respect to spokes 116 and journal boss 117. As best seenin FIG. 4, spokes 116, journal boss 117, and a motor mounting ringformation 118 extend axially from one end of rim 115 to a point aboutmidway of the length of rim 115, boss 117 has a through bore 117aradially disposed to cut into rim 115 as indicated at 120, spider arms121 have a minimal axial thickness and are located at said one end ofrim 115, and hub portion 119 is axially coextensive with ring formation118 and is provided with a multistepped through bore forming from rightto left in FIG. 4 a seat for the front rotor shaft bearing 122,'an outerbearing race abutment shoulder 123, and a rotor shaft opening 124. Endbell and arbor shaft support member 114, with arbor shaft and arborshaft bearing assembly hereinafter described in detail in place, isheldin assembled relation in bore 98' for journalled movement as hereinafterpointed out by a retainer ring 125 (FIGS. 4, 8 and 12) secured tohousing 97 by three cap screw and lock washer assemblies 125a (FIGS. 4and 8) threaded into tapped bores 112 of housing 97. Retainer ring 125as best seen in FIGS. 8 and 12 is provided along its inner peripheraledge with an approximate 90 arcuate recess 126 the opposite ends 127 ofwhich formlimit stops for cooperation with the protruding end of a rollpin 128 (FIG. 5) force fitted in a blind bore (not shown) provided inthe rearmost face of rim 115 angularly adjacently related to theclockwise edge of journal boss 117 as seen in FIGS. 5 and 8. Theprotrusion of roll pin 128 is correlated so the protruding end face doesnot extend a substantially greater distance than the thickness of ring125. The radial width of ring 125 is selected to exceed the combinedthickness of rim 115 (FIG. 8) and the cylindrical wallof housing 97 andits inner edge, except in the area of arcuate recess 126 where the inneredge of the narrowed portion is radially outwardly disposed to clearroll pin 128, extends slightly inwardly of rim 115 for a purpose to bepresently pointed out.

Motor housing 129 (FIGS. 4 and 7) at one end-is provided with radialspider arms 131 (preferably six equiangularly spaced) supportingacentered hub portion 132 having a concentrically related shaft bore 133extending axially inward into an enlarged "annular recess forming abearing seat 134 while the other end is openand defined by an annular,axially directed mounting flange 135 dimensioned to enter into motormounting ring formation 118 and provides an axially inwardly spacedannular abutment shoulder 137 (FIG. 7) disposed to abut the rear endface of ring formation 118 when assembled as shown in FIG. 4. Motorhousing 129 mounts stator windings 138 fixed to motor housing 129 inconventional manner, rear shaft bearing 139 mounted in seat 134, androtor assembly 141 including shaft 142 with fan 143 fixed thereon bysplit ring 144 entered through stator winding 138 to dispose the I rearend 145 of shaft 142 in bearing 139 prior to assembly withend bell andarbor shaft support member 114. Opposing brush holders 146, brushes 147,and brush securing caps 148 are likewise preassembled in thediametrically opposed tapped housing openings 151 immediately afterrotor assembly 141 is inserted in housing 129. The front rotor shaftbearing 123 being in place in seat 122 of member 114, motor housing 129with its rotor assembly 141 and brush assembly 146, 147 and 148 in placeis assembled with end bell and arbor shaft support member 114 byentering shaft 142into front shaft bearing 123 and axially moving motorhousing 129 and the assembled motor parts toward housing 97 until shaft142 protrudes through rotor shaft opening 124 and annular mountingflange 135 is fully inserted into ring formation 118 to abut flange endface 136with the opposing end face of ring formation 118. Housing129 isthen fixed to member 114 by means of a pair of long cap screws 152passed through lock washers 153, washer 154, the end apertures ofelevating worm gear segment 155 (F1637), the diametrically opposed ears156 formed on housing129 'and threaded into blind tapped bores (notshown) in the rear face of ring formation 118 all located radiallyinwardly of retainer ring 125.

Arbor shaft 157 is preassembled with arbor bearing 158 by passing theplain end of shaft 157 containing retainer ringgroove 159 through bore161 of arbor bearing 158 to expose. ring groove 159 at the rear end ofbearing 158 and inserting split retainer ring 162 (FIG. 5) in groove159. Arbor shaft 157 is thereby fixed against axial disassemblingmovement forwardly in arbor shaft bearing 158. Shaft bearing 158 of theing 97 and the front end face of rim and the arcuate seg-- ment of theouter race of bearing 128 lying within the notch 1200f rim 115 willengage the inner radial face of flange 99 to retain member 114 andbearing 158 against forward axialmovement respecting tilt bracket 23.Attachment of retainer ring 125 is then effected by passing it forwardlyaround motor housing 129 into position against the rear face of housing97 and the rear face portion of the outer race of bearing 158;

which protrudes rearwardly from bore 117a in notch to the rear edge ofrim 115, and threading screws l25ahome in tapped bores 112 of housing97. Ring 125, due to its end butting engagement with the rear face ofrim 115 and the rear face portion of the outer race of bearing 128,retains member 114 and bearing 128 against rearward axial movementrespecting tilt bracket 23. Arbor shaft 157 is fixed against axialmovement with respect to bearing 158 by the blade drive l pulley andclamping assembly upon tightening clamp nut 160 as will be more fullyhereinafter described. To assure free angular adjusting movement ofmember 114 together with the arbor shaft and arbor shaft bearing carriedin bore 117a, a running .clearance is provided between the end faces ofrim 115 and the outer bearing race of bearing 128on the one hand andflange 99 and ring on the other hand by appropriate axial dimensioningof rim 115, bearing 158, and journal bore 98.

With member 114 mounted in tilt bracket 23 as just described andcarrying motor casing 129 and the arbor shaft and arbor shaft bearingassembly, in fixed relative position as heretofore described, worm gearsegment will be disposed beneath motor casing 129 in close rearwardlyspaced relation to the rear face of tilt bracket 23 and its dependentmounting pad 108 and the arbor shaft will lie parallel to the coincidentaxes of bore 98and member 114 for 90 clockwise movement between itsnormal lowered position approximately as shown in FIGS. 2, 3 and 8 toits maximum raised position determined by uppermost limitstop 127 shownin FIG. 8.

Tilt bracket mounting pad 108 mounts on its planar back face lying intheplane of the rear face of cylindrical housing 97 an elongated controlshaft support bracket 28 of generally channel configuration in crosssection which comprises a planar mounting wall 165 (FIGS. 2, 3 and 8)formed at its inner left end as seen in FIG. 8 with three through screwopenings 166 spaced to cooperate with tapped bores 109 of pad 108,respective end walls 167 and 168, and respective sloping top reinforcingwalls 169 and 171 integrally joined to the top edges of walls 165, 167and 168. Suitable cap screws l72 passing freely through screw openings166 and threaded into tapped bores 109 of pad 108 fixedly secure supportbracket 28 to pad 108 with its end wall 168 spaced beyond pad 108 towardthe open front end of base or cabinet assembly 21. Referringparticularly to FIG. 8, it will be noted that end walls 167 and 168 areprovided with respective axially spaced coaxial through bores 173 and174, bore 174 having a lesser diameter than bore 173. These coaxiallyarranged bores serve as journal bores for a main control shaft 175 hav-'ing an enlarged diameter portion 176 extending from a shoulder 177formed at the juncture with a reduced diameter portion 179anddimensioned to extend from the inner face of end wall 168 to a freeend formed to provide a worm pinion 178 meshed with worm segment 155vertically below the coincident axes of motor housing 129, member 114and bore 98. Shaft portion 176 is provided with a ring groove 180axially spaced from shoulder 177 a distance slightly less than thespacing between the outer face of end wall 167 and the inner face of endwall 168 so a fibre wear washer 183 may be disposed in light abuttingcontact with shoulder 177 and the inner face of end wall 168 to assurefree rotation of shaft 175 in its journal bores.

The reduced diameter portion 179 extends from shoulder 177 throughjournal bore 174 to a point well beyond the open front end of base orcabinet assembly 21 and is provided at its free end with a ring groove181 (FIG. 13) and an axially inwardly spaced through bore 182 adaptingit to mount an adjusting hand wheel to be presently described. Shaft 175is fixed against relative axial movement with respect to support bracket28 by a second fibre wear washer 183 and a set collar 184 assembled onreduced shaft portion 179 from its free end into light bearing contactwith the outer face of end wall 168 and the opposing end face of collar184 which is fixed to shaft 175 by tightening set screw 191. The reducedshaft portion 179 is then provided with a third fibre wear washer 183and a sleeve shaft 192 (FIG. 13), including integral spur gear wheel 49,is journaled on shaft portion 179 in subjacent meshing engagement withgear segment 48 of bracket member 47. As best seen in FIG. 13, sleeveshaft 192 terminates inwardly of through bore 182 of shaft portion 179and mounts a clamp assembly 194 made up ofa flanged clamp sleeve 195including a reduced diameter noncircular formation 196 dimensioned toslidingly cooperate with slot 57 of bracket member 47 and fix clampsleeve 195 against free relative rotation on sleeve shaft 192 and acylindrical threaded shank 197 passing freely through slot 57 to receivewear washer 198 and a wavy spring washer 199 held in place by theinternally threaded hub of lock lever 201 threaded on shank 197. The endof sleeve shaft 192 projecting beyond the hub of lock lever 201 isannularly grooved at 202 and mounts an annularly flanged tilt hand wheel203 which is nonrotably fixed to sleeve shaft 192 by a set screw 204engaged in groove 202. Clockwise rotation of lever 201 advances the hubof lever 201 axially along clamp sleeve 195 to yieldingly clampinglyengage wall 56 of bracket member 47 between the clamping flange of clampsleeve 195 and washer 198 through the intermediary of spring washer 199and the abutting end face of the hub ofclamp lever 201 to arrest tillmovement of bracket 23 relative to base or cabinet assembly 23 and table22 at any selected angular adjustment through shaft 175 and supportbracket 28 carried by tilt bracket 23. When a tilt adjustment is to bemade lever 201 is rotated in a counterclockwise direction to relieve theclamp pressure and tilt hand wheel 203 is rotated in the desireddirection to rotate sleeve shaft 192 and its integral gear wheel 49meshing with stationary gear segment 48 to traverse gear wheel 49 alonggear segment 48 to shift sleeve shaft 192, main control shaft 175,support bracket 28, and tilt bracket 23 as a unit around tilt axis A tothe desired angular adjustment determined by reading tilt scale plate 71through lens plate 82 of table sight opening 74. Corresponding movementof tilt scale plate 71 is assured through the provision of a cam drivepin 206 (FIGS. 2, 3 and 8) having one end fixedly threaded into tappedbore 207 provided in the adjacently related trunnion protrusion 94formed on the end of tilt bracket 23 and its other end in the form ofacylindrical tip 208 drivingly extending through cam slot 70 of pivotedsegment plate 59. Zeroing adjustment of scale plate 71 may be effectedby setting tilt bracket 23 to dispose blade 29 at right angles to thework support surface of the table 22 determined by the application ofacarpenter's hand square to the table and blade, loosening the securingscrews 65a fastening bevel scale platen 66 to segment plate 59, shiftingplaten cars 67 and screws 65a along screw slots 65 of segment plate 59until a zero reading is obtained viewing scale plate 71 through lensplate 82, and tightening screws 65a to fix platen 66 and segment plate59 against rela tive movement. Since main control shaft 175 journals insleeve shaft 192 and support bracket 27 and due to its nonreversibleworm drive connection to worm gear segment is self locking in anyselected tilted position of the tilt bracket 23 and saw blade 29, itwill be appreciated that blade raising and lowering movement can beeffected at anytime merely by grasping and turning adjusting handwheel211 nonrotatably and axially fixed to the reduced diameter end of shaft175 by a roll pin 212 carried in shaft through bore 182 with its endsprotruding into axial blind end grooves formed in the hub bore ofhandwheel 211 and snap ring 213 in shaft ring groove 181.

Assembly of hand wheels 203 and 211 is effected after front coverassembly 215 containing arcuate slot 216 is slipped over the freeforward ends of shafts 175 and 192 to dispose the reduced diameter hubof lock lever 201 in forwardly protruding position in arcuate slot 216with its lever arm 217 disposed to swing back and forth in front of therearwardly inclining cover wall 218. Hex headed thread cutting screws219 passing freely through the inturned end flanges 38 of cabinet sideplates 35 at laterally aligned points below bracket member 47 andelongated spacer sleeves 221 and threaded into through apertures inangle tabs 222 spot welded to the inner face of wall 218 fix coverassembly 215 to side plates 35.

Blade 29 and shaft 157 are clamped to the inner race of arbor bearing158 between snap ring 162 and clamp nut 160 by abutting the blade sidefaces between the clamp flange 225 of splined pulley sheave 226 (FIGS. 3and 4) and clamp plate or flange 227. A spacer washer (not shown) ispreferably interposed between the inner end face of pulley sheave 226and the opposed end face of the inner race of bearing 158 to assureadequate running clearance between pulley sheave 226 and flange 99 oftilt bracket 23. A positive drive belt 228 encompassing the pulleysheave 226 and the splined end 229 of rotor shaft 142 provides a directdrive connection between rotor shaft 142 and arbor shaft 157 and blade29. By suitably relating the diameter of pulley sheave to the diameterof the splined end of rotor shaft 142, a desired rotating speed of blade29 is obtained. Since the motor, arbor assembly and blade, and the bladeraising and lowering controls and tilt controls are all directly carriedby the tilt bracket 23 and compactly fixedly related around tilt bracketbore 98, an unusually accurate and rigid saw assembly convenientlyarranged for adjustment and operation from a standing position at thefront of the saw is provided by the structure so far described. Thisconvenience of adjustment and operation is furthered by the mitre gageconstruction which will now be described in detail.

Referring principally to FIGS. 1,9 and 10, the mitre gage 34 carried inone or the other of table grooves 73 comprises a slide or guide bar 231dimensioned to closely slidingly flt in grooves 73 with its top faceflush with the work support surface of table 22 and drilled inwardlyfrom one end at 232 to freely receive pivot screw 233 with its shankprotruding upwardly from the plane of the top surface of bar 231 andthreaded into tapped bore 234 of mitre gage body 235 to pivotullyconnect body 235 to bar 231. Body 235 includes an upstanding wallportion 236 providing a planar work engaging face 237 right angularlyrelated to the plane of the bar top surface and the work support surfaceof table 22 and an arcuate segment 237 integrally formed on the face ofwall portion 236 opposite face 237 adjacent the base of wall portion 236using the pivot axis of screw 233 as a center. The rim of segment 237 isundercut to form a dependent rib 238, and two dependent ribs 239 locatedrespectively in clockwise and counterclockwise disposed relation to aplane containing the pivot axis of screw 233 and the longitudinalcenterline of bar 231 at 45 percent intervals clockwise andcounterclockwise from rib 238 for a purpose to be presently pointed out.The upper face of segment 237 slopes radially away from a point 241 onthe opposite face of wall portion 236 determined by a vertical planecontaining the longitudinal centerline of bar 231 to an arcuate verticalwall 242 inset from the peripheral edge of segment 237 to form aninwardly extending arcuate clamp surface 243 coextensive with theperipheral edge of segment 237. A circular laterally centered recess 244may be provided in 9 the sloping top wall of segment for receiving anidentification disc bearing the manufacturers name and trademark.

The upper edge of wall portion 236 at opposite sides of the aforesaidplane is provided with respective upwardly opening slots 245 parallel tothe aforesaid plane. Grooves 245 have straight vertical sides and areadapted to receive the shanks of clamp bolts or screws 246 threaded intoa jig fixture, preferably in the form of an elongated wooden block 247(see dot-dash lines FIG. 1), conventionally provided by the user toincrease the lateral dimension of the work engaging wall whereworkpieces of great length are to be cut. Due to the straight sidedgrooves the jig fixture can be assembled or disassembled on mitre gagebody 235 with screws 246 in place therein merely by loosening screws 246to back the screw heads away from their clamping position against theopposite face of wall portion 236 and lifting the fixture with screws246 in place vertically,.an impossibility in the conventional prior artstructures where the walls of the screw holes partially or completelyencircle the screws. The sloping face of arcuate segment 237 contiguousto arcuate shoulder 241 mounts an arcuate scale plate 248 graduated indegrees to angles of 60 in both directions from a zero indexing mark 251lying in the aforesaid parallel plane.

Mitre gage body 235 is normally fixedly secured to bar 231 by a clampassembly 252 fixed to the end of bar 231 adjacent the edge of arcuatesegment 237 and shown in detail in FIGS. 9 and I0. Clampassembly 252comprises an upstanding stud 253 having a reduced diameter threaded end254 threaded into tapped bore 255 provided in bar 231 inwardly from itsend 256, an internally ribbed, open ended clamp block 257 having astepped through vertical bore 258 therein to freely receive theupstanding threaded shank end 259 of stud 253 and the hub portion of aninternally threaded knurled clamp nut 261 threaded onto stud shank end259, dependent laterally spaced ears 262 abuttingly engaging the endface 256 of bar 231 at opposite sides of tapped .bore 264, a slide stopmember 265 having a body portion slidably received in rectangularopening 270 of block 257 and slotted at 266 to freely slidingly pass theunthreaded shank portion 267 of stud 253, and an elongated clamp plate268 apertured at 269 to freely pass stud 253 and supported in verticallyupwardly spaced relation to slide stop member 265 above inwardlyextending rib 271 of block 257 with its innermost end clearing rib 271by a wear washer 272 and spacer bushing 273 interposed between the upperface of slide stop member 265 and the underface of clamp plate 268 insurrounding relation to the shank of stud 253. Spacer bushing 273 isaxially dimensioned so that its upper end face will protrude slightlyabove the upper face of rib 271 when assembled in position on wearwasher 272 to assure a tight clamping of slide stop 265 and the mitregage body 235 upon tightening of knurled knob to force the outer freeend of clamp plate 268 against the arcuate clamp surface 243 of mitregage body 235 (FIG. 10). As best seen in FIGS. 9 and 10, knurled knob261 is annularly recessed at 274 and formed with an inset hub portion275 joined to knurled rim 276 by spider arms 277 to conserve materialand lighten the nut and is preferably closed by a snapin insert plate278 of any suitable material. A headed machine screw 280 threaded intotapped bore 264 engages the dependent ears 262 to fix block 257 againstshifting movement relative to bar 231 and stud 253.

"Referring particularly to FIG. 10, the upper end of block 257"overlyingclamp surface 243 of mitre gage body 235 is notched at 279 to provide anoutwardly and downwardly sloping bottom wall drilled and tapped at 281to receive an attachment screw 282 for adjustable fixing a pointer 283having a tip overlying scale plate 248 to cooperate with the angleindicia formed thereon. Angular adjustment of mitre gage assembly 34 isreadily effected by an operator standing in normal operating position atthe front of saw as heretofore pointed out by loosening knurled knob 261to release the clamping pressure on clamp plate 268 and grasping mitregage body 253 and pivoting it around pivot screw 233 to register pointer283 with the desired graduation on scale plate 248 and tighteningknurled knob 261. Since scale plate 248 slopes downwardly toward theoperator, precise adjustment to the desired angle may be visiblyeffected from a normal standing position. In event counterclockwisepivoting movement to the frequently used 45' position to the right inFIG. 1 is desired slide stop member 265 may be employed merely byleaving it in its innermost position as shown in FIG. 10 and pivotingbody 235 until rib 239 at the right of rib 238 abuts the opposing sideface of slide stop member 265. Return movement to the normal ninetydegree cutting position shown in FIG. 10 is likewise effected byclockwise pivoting movement of body 235 until rib 238 abuts the oppositeopposing side face of slide stop member 265. In event counterclockwiseangular adjustment beyond the 45 angular position is desired orclockwise angular adjustment beyond the normal position is desired, theoperator, after loosening knurled knob 26], grasps the finger holdportion 284 of slide stop member 265 and pulls outwardly to shift slidestop member 265 to the left as seen in FIG. 10 until the opposite end ofslot 266 engages stud 253. in this position the inner end of slide stopmember 265 will be withdrawn from beneath the rim of segment 237 to aposition clearing ribs 238 and 239 freeing mitre gage body 235 for freepivoting movement in either direction. The opposite 45 angularadjustment can be rapidly effected by first withdrawing slide stopmember 265 to clear rib 238 and then returning it to its innermostposition so the opposite rib 239 will abut the side face of slide stopmember 265 employed in setting the mitre gage 34 to its 90 cuttingposition.

It will be appreciated from the foregoing description that the tiltangle adjustment of the blade, raising and lowering of the blade, andangular cutting adjustment of the mitre gage from the operators normalstanding position at the front of I the saw are made possible by thisinvention with equal facility as well as adjustment of the rip fence todetermine accurate ripping widths of the work piece in conventionalmanner and visual reading of the blade tilt scale, the mitre gage anglescale and the rip fence scale.

The invention may be embodied in other specific forms without departingfrom the spirit or essential characteristics thereof. The presentembodiment is therefore to be con sidered in all respects asillustrative and not restrictive, the scope of the invention beingindicated by the appended claims rather than by the foregoingdescription, and all changes which come within the meaning and range ofequivalency of the claims are therefore intended to be embraced therein.

We claim:

1. An improved table saw comprising a support base; a work support tablemounted on said base and provided with a fore v and aft elongated bladeopening therethrough, trunnion supported bracket means mounted beneathsaid work support table to tilt with respect to said work support tablearound an axis lying in the plane of said work support table surfacealong the line of intersection of the saw blade with said plane, saidtrunnion supported bracket means comprising a main body having front andrear laterally directed trunnion protrusions thereon and an annularlaterally directed opening lying between said trunnion protrusions;blade and arbor support means directly mounted on said bracket forraising and lowering movement with respect to said work support table,said blade and arbor support means comprising an electric motor end belljournaled in said laterally directed opening and provided with l. aradially offset bearing seat mounting the outer race of an arbor shaftbearing carrying an arbor shaft in its inner race fixedly mounting a sawblade thereon between a flanged axially splined pulley belt sheave andclamp plate and nut assembly, 2. a coaxial motor shaft opening passingtherethrough and 3. a motor rotor shaft, having a splined end, journaledin said motor shaft opening of said motor end bell, said splined rotorshaft end and said splined pulley sheave being drivingly connected by apositive drive belt; support bracket tilt and blade arbor and bladeraising and lowering control means directly mounted on said bracketmeans and comprising shaft means extending in a fore and aft directionand terminating forwardly of said support base in respectiveconcentrically related hand operated adjustment wheels whereby anoperator standing in normal operating position at the front of saidtable may effect operation of said adjustment wheels to effect depth ofcut and tilt angle adjustments of said blade.

2. The saw of claim 1 wherein said work support table is provided with athrough sight opening formed in the work support table forwardly of saidblade opening and laterally centered on the tilt axis of the saw; tiltangle scale means moveable in response to tilting movement of saidbracket means is pivoted to said support base in subjacent juxtapositionto said sight opening to expose said tilt angle scale means to viewthrough said sight opening; a mitre gage groove paralleling said tiltaxis is formed in said table at least at one of said blade opening; anda mitre gage assembly is slidably mounted in said mitre gage groove andincludes a slide bar, a pivoted body carried by said bar and having aflange of arcuate configuration mounting an arcuate upwardly andforwardly facing scale means whereby an operator in said standingposition at the front of said table saw to operate said adjustmentwheels may also visually determine the blade tilt angle and the angleofcut of a workpiece to be fed to said blade.

3. The saw of claim 1 wherein said electric motor has a worm gearsegment fixed to its housing; and said shaft means of said raising andlowering control means is provided with a worm drive pinion meshing withsaid worm gear segment whereby said motor and motor end bell may berotated in said laterally directed support bracket opening upon handoperation of its associated adjustment wheel to shift said blade andarbor shaft between lowermost and uppermost positions around the axis ofsaid rotor shaft to effect raising and lowering of said blade throughsaid blade opening of said work support table.

4. The saw of claim 1 wherein said support bracket tilt and blade arborraising and lowering control means comprises a shaft support bracketfixed to a side of said supported bracket means and having fore and aftspaced shaft journal seats, a main control shaft journaled in said shaftjournal seats with its rear end extending rearwardly beyond said shaftsupport bracket into juxtaposition to said blade and arbor support meansand terminates in a worm drive pinion and with its front end extendingforwardly from said shaft support bracket beyond said support base, aspacer collar fixed to said main shaft in end abutting relation to theforward end of said shaft support bracket, a sleeve shaft journaled on aportion of said extending front shaft end in end abutting relation tosaid spacer collar and includes a rack gear pinion disposed injuxtaposition to a portion of said support base, respective adjustmenthand wheels fixed to the extreme forward ends of said sleeve shaft andsaid main shaft for independently rotating said respective shafts; aworm gear segment is fixedly secured to said blade and arbor supportmeans in meshing engagement with said worm drive pinion to effectraising and lowering movement of said blade arbor means when said maincontrol shaft hand wheel is rotated; and segment gear rack means isprovided in laterally extending relation to said support base in meshingengagement with said rack gear pinion to effect tilting movement of saidsupport bracket, said blade and arbor support means, and said shaftsupport bracket and control means as a unit around said tilt axis tovary the angular relation thereof with respect to said work supporttable when said sleeve shaft hand wheel is rotated.

5. The saw of claim 2 wherein said sight opening is provided with a lensclosure plate including an index mark lying in the plane of said tiltaxis permitting the operator in said standing position to accurately setthe tilt angle of the blade in accord with the readings of said scalemeans.

6. The saw of claim 2 wherein said mitre gage assembly includes anupstanding stud fixed to said slide bar in adjacently spaced relation tosaid pivoted body and a clamp block assembly fixed to said slide bar instraddling relation to said stud and including a vertically movableclamp plate apertured to freely pass said'upstanding stud and supportedwith one end in vertically spaced overhanging relation to the rim ofsaid arcuate flange and a clamp nut threaded on the upper end of saidstud for threaded movement into and out of engagement with said clampplate to force said clamp plate end into clamping engagement with therim of said arcuate flange.

7. The saw of claim 6 wherein said clamp block assembly includes a slidestop member having a slotted leg freely passing said upstanding stud andsupported for sliding movement from an inoperative position to aposition beneath the rim of said arcuate flange, spacer meansencompassing said stud between said clamp plate and slotted leg fortransmitting clamping pressure from said clamp plate to said slotted legto fix said slide stop member in a selected one of its positions, andsaid arcuate flange includes angularly spaced, dependent rib structuresbeneath said rim forming indexing abutments cooperating with saidslotted leg to determine the frequently used settings of the mitre gage.

8. The saw of claim 1 wherein said elongated blade opening providesinwardly directed support ears having tapped apertures therein normal tothe work support surface of said work table to receive mounting screws,closure plate means including a blade slot therein and upwardly facingcountersunk screw passages disposed to align with said tapped aperturesis provided for closing said blade opening, said closure plate means isresiliently supported on said support ears through compressibleelastomeric bushings apertured to pass the shanks of mounting screwsprovided to secure said closure plate means to said ears, and flatheaded securing screws having shanks passingdownwardly through saidcountersunk screw passages and said bushings and threaded into saidtapped apertures are provided to secure said closure plate means to saidears and draw said closure plate means toward said ears upon tighteningsaid screws from above the work table to individually compress saidbushings to the degree necessary to level the surface of said closureplate means with the work support surface of said table.

9. A tilt bracket, saw blade arbor and motor assembly for a tiltingarbor saw including a work support table having dependent front and reartrunnions fixed to its underside and an elongated through blade openingcomprising a main bracket member having front and rear laterallydirected trunnion protrusions at its opposite ends and an annularlaterally directed opening lying between said trunnion protrusions withits axis in a plane intersecting said through blade opening at rightangles adjacent an end thereof; a blade and arbor support meanscomprising a motor end bell journaled in said annular laterally directedopening of said main bracket member and including 1. an outer annularrim, 2. a radially inwardly coaxially disposed motor mounting ringfixedly connected to the interior of said outer annular rim by radiallydirected spokes one of which adjacent the outer rim is transverselyenlarged and through bored to form a cylindrical through passage havingan axis paralleling the outer annular rim axis and intersecting thethrough blade opening, and 3. an arbor bearing comprising an inner racefixedly mounting a blade arbor shaft with an end projecting beyond oneend of said outer annular rim and an outer bearing mounted in saidthrough bore; means fixing said motor end bell against axial movementwith respect to' said annular laterally directed opening; and anelectric drive motor having a casing fixedly secured at one end to theend of said coaxially disposed motor mounting ring oppositely related tosaid one rim end with its rotor shaft extending from said one casing endthrough said mounting ring and beyond the other casing end.

10. The assembly of claim 9 wherein said motor casing adjacent andinwardly from said one end mounts a worm gear segment in radiallyoutwardly disposed relation to said motor casing and said main bracketmember, at the side thereof from which the motor casing protrudes,fixedly mounts a shaft journal bracket having spaced axially alignedjournal bores lying in a plane defined by aradius of said worm gearsegment, and a worm drive shaft is journaled in said journal bores inmeshing engagement with said worm gear segment to effect bodily rotationof said motor end bell in said laterally directed open-

